Boiler



1927' w. J. FISHER BOILER Filed March 8, 1924 Patented Jan. 25, 1927.

UNETED STA'l'Efi PATENT orricn.

WILLIAM J. FISHER, OF YORK, PENNSYLVANIA, ASSIGNOE TO A. B. FARQ'UI-IARCO.

LTD, OF YORK, PENNSYLVANIA, A LIMITED PARTNERSHIP OF PENNSYLVANIA.

BOILER.

Application filed March 8, 1924. Serial No. 697,905.

This invention relates to boilers of the in ternal furnace tubular type,and has particular relation to the inner construction of the rearcombustion chamber thereof.

The primary object of this invention is the provision of an improvedlining for the rear combustion chamber of an internal furnace tubularboiler.

Another object of this invention is the provision of an improvedmetallic lining for the rear combustion chamber of such a boiler.

Another object of my invention is the provision of an improved metallicsectional perforated lining for the rear combustion chamber of such aboiler.

Another object of my invention is the provision of an improved means forsecuring doors to the end of combustion chambers of certain types ofboilers.

Another and further object of my invention is to provide an improvedmeans for securing the lining to the combustion chamber wall, whichmeans will minimize the coipduction of heat from the lining to the wa 1.

Other and further objects will be app-an ent, from the specification, tothose skilled in the art.

Referring to the drawing wherein I have illustrated a preferredembodiment of my invention:

Fig. 1 is a perspective view of my invention as applied to a boilershowing the doors of the rear combustion chamber open;

Fig. 2 is a longitudinal sectional view of a boiler having my inventionapplied thereto, and

Fig. 3 is a fragmental detail view of the outside of the boiler showingthe side of the boiler at the rear combustion chamber end.

Like reference characters refer to similar parts throughout the severalviews.

In the drawing, 10 designates the shell of the boiler, 11 the steam domeand 12 the smoke stack.

The numeral 15 designates the rear combustion chamber, 16 the fire boxor internal furnace, and 17 the tubes. The fuel is placed in the firebox 16. The smoke and hot gases pass to the right, as shown in Fig. 2into the rear combustion chamber 15 and return through the tubes 17 tothe stack 12 from whence they escape into the air.

spaced lugs 41 cast therewith for cooperation and coaction with the lugs11*. A bolt 41 passes through the lugs ll and 41 and constitutes,therewith, the hinge. The lugs 41 are spaced so that they will rest,each on its corresponding lug 11 v The rear combustion chamber at itsouter and cylindrical side and at its outer end, is provided with asuitable metal lining which I preferably make of cast iron and insections.

The upper portion is made preferably in two sections 25, 26 as shown inFig. 1. These two sections are preferably flat and are located on alower level than the steam spacein order to protect the end ofthe boilerat this point. The sections 25 and 26 are provided, respectively, withflanges 25, 26 to co-operate with and overlap adjacent sections, thusproviding for expansion and easy installation. These sections 25, 26 areheld in spaced relation to the cylindrical shell 10 of the boiler bysuitable spacing lugs 25, 26, 25 26 of which there are two each for eachplate. These spacing lugs may be made separate from or integral withtheir respective sections. I prefer, however, to make them integral andhave so shown them.

Suitable bosses 25, 26 are provided for the respective sections and areintegral therewith. These bosses are provided with threaded studs 25, 26cast therein. These studs 25 and 26, pass through the outer shell of therear combustionchamber, where nuts 25 and 26 hold them in place.

Spaced around the boiler from the section 26 are other segmentalsections which conform to the cylindrical surface of the rear combustionchamber, but in spaced relation therefrom. These sections I havedesignated 30, 31, 32, 33, 34, 35 and 36. Each of these sections isprovided with an overlapping flange corresponding to the flanges 25 and.26 and mean POSltLOIltO overlap.

the adjacent sections. Each of these sections" is also provided withsuitable means-forholding the sections in a" spacedmelationfrom theoutside wall of :the: rear combustion chamber. I have shown spacers suchas the blocks or lugs 30, 32, 33 34 for:

the respective sections to prevent contact with the shell. Ialso-provide bosses for the respective sections as shown at 32. and.

33 and cooperating studs SQ and 33, similar to the studs 25 and 26, tohold the sections in place.

Ih'ave found that.a construction which isvery satisfactory is one in'whiclrthe sections 25, 26; 30, 31, 32,133, 34, 35, 36" are eachprovided with two bosses with their corresponding studs to hold theplates in position andlare so constructed that the bosses willhearranged on to the axis ofthe boiler andspaced from the end of theirrespective sections It is to he noted thatthe lugs and bolts furnish.

very little metallic cross-section through which heat canbe conducted.

Fixed to the doors 18 and 19, respectively, are the liner sections'37land '38. One of these sections, .as. 38, is provided. with an.overlapping. flange, as. shown. at 39, for cooperation withktheadjacent'edge of the complementary section 37.

The upper edge ofthe sections 37," 38 are ofla height'to pass undenthesections 25, .26, thedatter extending over the sections 37, 38when thedoors are closed.

These sections 37 and '38 are provided with spacing lugs as shown at3T", similar to ,thelugs 25, 26'-andare shown as being integral withthe. door. Studs 37 38 are provided with suitable bosses'as indicated at37.. in Fig. 2 and secure the sections 37, 38,-respectively, to theirdoors.

The sections 37rand 38 are provided, respectively, with integralextensions 37 38? which extend fromwthe main bodies ofthe sections atsuch an angle that they will clear the hinge plates 40, tlwhen the doorsare closed. These extensions 37 38 have areuate edges which, when thedoors are closed,;,

willb be in close proximity .to the sections 30, 31, and T36, 35 andSet-respectively.

In ordercto prevent warping,each of the liningwsections 25. 26,- 30, 31,32, 38, 34,;

35, .36, 3?..and138 "is preferablyperforated' as shown inthe drawing, I

It is thusiclearzthat .Ifhaveprovided an efiicient rear. combustion.chamber.- lining which. from 1 its construction will protect the shellof 'therear. combustionchamher, is easy to install. and which hasprovision. for

line parallel expansion and contraction and is so constructed as topermit a minimum ofwarpage due to temperature"changes.

\Vhi-le' I have shown and described in detail an embodiment of myinvention, I desire to .have 'itunderstood that I do not limit myself tothe exact showing and that modifications and changes may be made withoutdeparting from the spirit of my invention and within the scope of theappended claims.

Having described my invention, what I claim is l. A boiler having acombustion chamber having an air cooled outside'wall, a lining therefor,the lining, being; spaced wholly from. the wall of the combustionchamberandmeans for holding the lining in position in spaced relation to thecombustion chamber wall, the space'between the lining andwallbeingco-extensive with the lining, said means having very smallcontacting surface with the wall wherebythe conduction of 'heat from thelining to the outer wall is minimized, the upper portion of'thc liningextending across the chamber adjacent the level of the lower portion ofthe steam space of the boiler.

2. A boiler having a combustion chan'iber,

chamber, the space between the lining and wall extending throughout theaxial length of the lining and means for holding the linmg in positionin spaced relation to the combustion chamber wall, said means being of a.shape and so placed as to permit ofa free air or gas communicationbetween'the spaces outward of adjacent lining sections, the upper liningsections extending across the chamber adjacent the level of the lowerportion of the steam space of the boiler.

3.'A. chamlier, hinged doors for closing the end thereof, a lining forthe rear combustion chamber, said lining comprising perforated sectionsabout the cylindrical side and perforated sections on the doors,thesections about the cylindrical side having portions overlappingadjacent. l'QSlDECblVQ sections. the doorsectious cooperating with thesections about the cylihdnical side of the rear combastion chamber, thedoor sect-ions having portions at an angle to the main-bodytherm of 'andmeans for spacedly holdingthe liningsections from. the wall and doors,respectively.

lnitestirnony whereof I hereunto aflix my signature.

WILLIAM FISHER.

boiler having a rear combustion

